add_action ( 'edit_category_form_fields', function( $tag ){
    $cat_title = get_term_meta( $tag->term_id, '_pagetitle', true ); ?>
    <tr class='form-field'>
        <th scope='row'><label for='cat_page_title'><?php _e('Category Page Title'); ?></label></th>
        <td>
            <input type='text' name='cat_title' id='cat_title' value='<?php echo $cat_title ?>'>
            <p class='description'><?php _e('Title for the Category '); ?></p>
        </td>
    </tr> <?php
});
add_action ( 'edited_category', function() {
    if ( isset( $_POST['cat_title'] ) )
        update_term_meta( $_POST['tag_ID'], '_pagetitle', $_POST['cat_title'] );
});